Trade waste management plan (example)*
1.0
General description
This trade waste management plan has been submitted to Watercare to satisfy the
requirement of clause 6 of our trade waste agreement under the Auckland Trade
Waste Bylaw 2013.
Company
XYZ Manufacturing Company Ltd.
Agreement number
4XXX.
Site address
42 Smith Street, St Johns, Auckland.
Discharge point
Manhole 123456 in Smith Street, St Johns, Auckland.
Key contacts
John Smith, Environmental Manager Ph. 012 3456 789.
Garry Mill, Maintenance Manager Ph. 012 789 123.
Sarah Grey, Operations Manager Ph. 012 9876 543.
Principle operations
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
XYZ Manufacturing Company Ltd processes raw
seafood into products for commercial sale. This
involves washing and processing the seafood and
produces wastewater which is discharged to
Watercare’s wastewater network.
The company also has a blending plant. This
produces wastewater with a high pH which is
chemically dosed prior to discharge.
All trucks and bins that deliver and hold the raw
seafood are washed in the truck wash area. The
wash water from this area is discharged to sewer
as is any stormwater that falls on the area.
Most raw products for the blending plant are
delivered in small containers. One raw product is
delivered by tanker truck.
2.0 Discharge limits
2.1.
Limits specific to our agreement
Refer to clause 13 of your agreement
Requirement
Parameter
Maximum discharge flow rate
Maximum 24-hour discharge volume
pH
Maximum temperature:
2.0 l/s
30 m3
6.0 to 10.5
40°C
Other parameters (maximum discharge concentration and mass)
Oil and grease
Suspended solids
Sulphate
Sulphide
Total petroleum hydrocarbons C7-C14
Total petroleum hydrocarbons C7-C36
Stormwater discharge
200 mg/l
20 kg/day
500 mg/l
5 mg/l
30 mg/l
50 mg/l
Stormwater falling on the truck and bin
Document Number – 12456
Issue date - 03/09/2014
Note - All printed copies are uncontrolled – this copy printed on 03/09/2014
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wash area (approximately 50 square
metres) can be discharged from the area
into our network. See Appendix D for site
plan and photos.
2.2.
General limits
XYZ Manufacturing Company Ltd will meet all discharge limits as specified in the
Auckland Trade Waste Bylaw 2013 including the controlled substances standards
(see appendix B). We will review this standard annually to check for
updates/changes.
3.0
Pre-treatment systems
Refer to clause 14.1 of your agreement for your
types of pre-treatment and maintenance
Control for
Solids greater than 30 mm
System
6 mm fixed screens on all
drains in manufacturing
rooms and truck and bin
wash area
Flow under 2 l/s
1 l/s orifice on outlet from
balancing tank in
manufacturing room.
1 l/s orifice on outlet from
chamber one of TPH/solids
sedimentation tank on the
truck and bin wash area.
Oil and grease under 200
mg/l
Three chamber oil and
grease (2 m3 each)
interceptor connected to
drain from manufacturing
rooms
Suspended solids under 20
kg/day, total petroleum
hydrocarbons (C7-C14)
under 30 mg/l and total
petroleum hydrocarbons (C7C36) under 50 mg/l.
Single chamber
sedimentation tank and total
petroleum hydrocarbons
inceptor (5m3) installed on
drain from truck and bins
wash area.
pH between 6.0 to 10.5
pH dosing system which
measures pH and doses
sulphuric acid to lower the
pH. It has one probe which
measures the pH in the
balance tank and one probe
which measures pH on the
outlet to the sewer. The
balance tank discharges via
a 1 l/s orifice to the sewer.
Maintenance
Daily inspection at end of
day. Any material collected
on screens is manually
removed. Material is
disposed to landfill via
weekly collection. Recorded
on end of day shutdown
sheet.
Six monthly inspection of
orifice. Recorded on six
monthly maintenance sheet.
Monthly empty and clean by
registered waste disposal
company. Waste taken off
site. Monthly inspection.
Recorded on interceptor
maintenance sheet.
Three monthly empty and
clean by registered waste
disposal company. Waste
taken off site. Monthly
inspection. Recorded on
TPH/sedimentation tank
maintenance sheet.
The pH probes are calibrated
internally monthly. An annual
service and calibration is
completed every year by an
external contractor. Both are
recorded on the pH probe
maintenance sheet. A daily
inspection is completed on
the dosing system and
chemicals are replaced as
Document Number – 12456
Issue date - 03/09/2014
Note - All printed copies are uncontrolled – this copy printed on 03/09/2014
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required. This is recorded on
the end of day shutdown
sheet.
See schematic and photos of each pre-treatment system in Appendix C.
See site plan in Appendix D for layout position of pre-treatment systems on site.
4.0
Monitoring and logging systems
Include any systems that continuously
monitor and/or log your discharge eg.
flow, temperature, pH.
The pH dosing system includes two pH probes. One is in the balancing tank which provides
feedback for the dosing. The second pH probe is in the outlet pipe from the balance tank. It
confirms the pH of the discharged water from the production rooms.
We will record pH continuously with the outlet probe. This will be reported as a graph to
Watercare on a monthly basis.
Both pH probes undergo a monthly calibration by internal staff. An annual service and
calibration is completed every year by an external contractor. This is recorded on the pH
probe maintenance sheet. A daily inspection is completed on the pH probes. This is
recorded on the end of day shutdown sheet.
5.0
Risks and controls
The table below identifies the on-site risks that could lead to a discharge of non-compliant
wastewater to the sewer. The control measures taken to eliminate, isolate or minimise these
risks are shown.
Risk
Flow rate higher than allowed limit
Total daily volume discharged higher
than allowed limit
Non-compliant solids entering trade
waste
Failure of pre-treatment system
Control
Orifices on both outlets to control flow to 1 l/s or
less.
Manual release of wastewater from balancing
tank with a sheet to record discharge. Wastewater
will be stored overnight if it has reached the total
daily allowed volume. Water use at the truck/bin
wash is limited by use of high-pressure waterblasting system.
6 mm fixed screens on all trade waste drains
which lead to the sewer. Daily cleaning of screens
and removal of waste. This waste is disposed
offsite. All activities are recorded.
Daily and monthly inspections. Repaired and
calibrated as required. Systems are routinely
maintained. Inspections and maintenance are
recorded. Six monthly testing for suspended
solids, oil and grease, sulphate, sulphide and TPH
and continuous pH monitoring provides feedback
on the efficiency of the pre-treatment system.
Additional testing will be completed as required to
Document Number – 12456
Issue date - 03/09/2014
Note - All printed copies are uncontrolled – this copy printed on 03/09/2014
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Risk
Control
troubleshoot any issues.
Spill of stored chemicals
Most chemicals are stored in an area which is
isolated from the trade waste system. Those
chemicals which are in the production areas are
bunded. Spill kits are available at each area and
all staff are trained in our spill response procedure
(see Appendix E).
Spill from tanker while unloading raw
All unloading occurs in a bunded area which is
products
isolated from the trade waste system. All staff
involved in unloading (including the tanker drivers)
are trained in the unloading process and the spill
response procedure. Spill kits are available at the
tanker unloading area. If there was a major spill it
would be disposed of via a registered water
disposal company.
Fuel or oil spill while tanker unloading
See above. All tanker companies are required to
provide maintenance logs to ensure tankers are
regularly maintained.
Power failure
In the event of a power failure the water-blasting
of trucks and bins will stop as these are mains
supply. Other production in the plant will stop due
to the requirement for power to run the plant.
Wastewater is only discharged manually from the
balancing tank when it is within the limits, so a
non-compliant discharge will not occur. Once
power supply is restored a complete check of the
pre-treatment system will be undertaken before
production continues. A small backup generator is
available on site should it be required to minimise
any risk of a non-compliant discharge.
Stormwater from other areas entering the The truck and bin wash area is surrounded by a
truck and bin wash area
small raised hump to prevent stormwater from the
surrounding area entering this area (see site plan
and photos Appendix D).
Spill from or failure of processing
All process tanks are located in a bunded area
tanks/baths
which is isolated from the trade waste system.
Rainfall ingress into bins prior to washing Staff are trained to ensure all bin lids are closed at
all times.
This section should include all risks at your site as well as their controls as per
clause 6.1 (c) and (d) of your agreement. It must at least include the risks for
flow rate control, failure of a pre-treatment system, spills and power failure.
6.0
Internal notification procedure
All staff are trained to notify their superior in the event of an incident. Within 60 minutes of
the event the following will occur:

The superior will notify the shift supervisor. Depending on the nature of the event it
will escalate through the following roles. The most appropriately qualified role will
attend to the incident.
o Shift Supervisor reports to Operations Manager and Environmental Manager.
Document Number – 12456
Issue date - 03/09/2014
Note - All printed copies are uncontrolled – this copy printed on 03/09/2014
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o
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If appropriate the Operations Manager reports it to the Maintenance Manager
for any repair requirements.
o The Environmental Manager will report the incident to Watercare Services Ltd
through the process outlined in the external notification procedure in section
7.0.
o The General Manager will be notified of a major incident by the Operations
Manager.
o This notification procedure is posted on the staff board in the main
administration building along with a copy of this plan.
Authority will be delegated in the event any role is absent or not available.
On-call numbers are identified in the staff board in the main administration building.
All incidents will be discussed at our monthly operations meeting. Remedial work will also be
monitored and reported at this meeting. Any changes to existing protocols and this plan are
reported at this meeting.
Include that any incident will be attended to within 60 minutes as per clause 6.1 (e) of your agreement. List
any additional methods to avoid, remedy or mitigate the breaches as per clause 6.1 (f).
7.0
External notification procedure
In the event of a potential or actual breach of any of the discharge limits of our trade waste
agreement, the following will occur:
(a) As soon as practicable after becoming aware of the potential or actual breach, we will
notify Watercare on (09) 442 2222;
(b) Within two working days, we will provide Watercare with written details of the potential or
actual breach, and work undertaken to remedy or mitigate any adverse effects to the
Watercare network arising from the breach;
(c) Within five working days, we will provide Watercare with written details of investigations
into the cause of the breach, and implement measures to avoid a similar breach occurring in
the future.
The plan must include the external notification
procedure above as per clause 6.4 of your
8.0 Review of this plan
agreement.
This plan will be reviewed 12 months after the commencement date and annually thereafter.
We will provide Watercare with a copy of the plan if it has changed. If it has not changed we
will notify Watercare that it has been reviewed and no amendments have been made.
The review of the plan will be discussed on an annual basis at our monthly operations
meeting.
Document Number – 12456
Issue date - 03/09/2014
Note - All printed copies are uncontrolled – this copy printed on 03/09/2014
Page 5 of 6
9.0
Appendixes
Appendix A
Trade Waste Agreement 4XXX – Dated 01/09/2014.
Appendix B
Controlled Substance Standards.
Appendix C
Schematic and photos of each pre-treatment system.
Appendix D
Site plan and photos of open areas draining to trade waste drains.
Appendix E
Emergency spill response procedure.
If this procedure forms part of another
document, you may simply provide a copy of
the relevant section from the other document.
*This trade waste management plan is an example only. The plan for your company must
reflect your processes and trade discharges at your site.
Document Number – 12456
Issue date - 03/09/2014
Note - All printed copies are uncontrolled – this copy printed on 03/09/2014
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